glad your son has started feeling more comfortable having a poo, just a wonder if hes still in nappys why not get him to sit on a potty, help him relax by chatting to him making it fun, my son started fine but after about 2yrs of age he started messing and they couldnt say why he just didnt realise, so in the end i had him take a book to bathroom and read book,comic,while sat on toilet he would get 30mins, now being 17 its hard to get him to keep to routine but i notice every now and again he will disapear in bathroom with his ds and be in there a while, hope things are improving for you and your son